Javascript is not enabled on this browser. This site will not work properly without Javascript.
PhosphoSitePlus Homepage Cell Signaling Technology
Home | Login
About PhosphoSiteUsing PhosphoSiteprivacy & cookiesCuration ProcessContact
logos LINCs Logo Mt Sinai Logo NIH Logo NCI Logo
Search / Browse Functions
Protein Page:

CYBB Critical component of the membrane-bound oxidase of phagocytes that generates superoxide. It is the terminal component of a respiratory chain that transfers single electrons from cytoplasmic NADPH across the plasma membrane to molecular oxygen on the exterior. Also functions as a voltage-gated proton channel that mediates the H(+) currents of resting phagocytes. It participates in the regulation of cellular pH and is blocked by zinc. Defects in CYBB are a cause of granulomatous disease,chronic, X-linked (CGD). A disorder characterized by the inability of neutrophils and phagocytes to kill microbes that they have ingested. Patients suffer from life- threatening bacterial/fungal infections. Defects in CYBB are a cause of mycobacteriosis atypical X-linked type 2 (AMCBX2). A rare condition characterized by predisposition to illness caused by moderately virulent mycobacterial species, such as Bacillus Calmette-Guerin (BCG) vaccine and environmental non-tuberculous mycobacteria, and by the more virulent Mycobacterium tuberculosis. Other microorganisms rarely cause severe clinical disease in individuals with susceptibility to mycobacterial infections. Note: This description may include information from UniProtKB.
Protein type: EC 1.-.-.-; Membrane protein, integral; Membrane protein, multi-pass; Mitochondrial; Oxidoreductase
Chromosomal Location of Human Ortholog: Xp21.1-p11.4
Cellular Component: cell soma; dendrite; endoplasmic reticulum membrane; Golgi apparatus; integral component of plasma membrane; mitochondrion; NADPH oxidase complex; nuclear envelope; perinuclear region of cytoplasm; phagocytic vesicle membrane; plasma membrane; rough endoplasmic reticulum
Molecular Function: electron transfer activity; FAD binding; heme binding; metal ion binding; protein binding; protein heterodimerization activity; superoxide-generating NADPH oxidase activity; voltage-gated ion channel activity
Biological Process: antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; cell redox homeostasis; hydrogen peroxide biosynthetic process; inflammatory response; innate immune response; ion transport; neutrophil degranulation; positive regulation of angiogenesis; positive regulation of tumor necrosis factor biosynthetic process; respiratory burst; response to drug; response to nutrient; superoxide anion generation; superoxide metabolic process; vascular endothelial growth factor receptor signaling pathway
Disease: Granulomatous Disease, Chronic, X-linked; Immunodeficiency 34
Reference #:  P04839 (UniProtKB)
Alt. Names/Synonyms: CGD; CGD91-phox; CY24B; CYBB; Cytochrome b(558) subunit beta; Cytochrome b-245 heavy chain; cytochrome b-245, beta polypeptide; Cytochrome b558 subunit beta; gp91-1; gp91-phox; GP91PHOX; Heme-binding membrane glycoprotein gp91phox; NADPH oxidase 2; Neutrophil cytochrome b 91 kDa polypeptide; NOX2; p22 phagocyte B-cytochrome; p91-PHOX; Superoxide-generating NADPH oxidase heavy chain subunit
Gene Symbols: CYBB
Molecular weight: 65,336 Da
Basal Isoelectric point: 8.9  Predict pI for various phosphorylation states
Select Structure to View Below


Protein Structure Not Found.
Download PyMol Script
Download ChimeraX Script

STRING  |  cBioPortal  |  Wikipedia  |  Reactome  |  neXtProt  |  Protein Atlas  |  BioGPS  |  Scansite  |  Pfam  |  RCSB PDB  |  ENZYME  |  Phospho3D  |  Phospho.ELM  |  GeneCards  |  UniProtKB  |  Entrez-Gene  |  GenPept  |  Ensembl Gene